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Diabetes 51:3331-3335, 2002
© 2002 by the American Diabetes Association, Inc.

Brief Genetics Reports

A Functional Polymorphism in the Promoter of UCP2 Enhances Obesity Risk but Reduces Type 2 Diabetes Risk in Obese Middle-Aged Humans

Franz Krempler1, Harald Esterbauer2, Raimund Weitgasser3, Christoph Ebenbichler4, Josef R. Patsch4, Karl Miller5, Mingqiang Xie2, Veronika Linnemayr2, Hannes Oberkofler2, and Wolfgang Patsch2

1 Department of Internal Medicine, Krankenhaus Hallein, Hallein, Austria
2 Department of Laboratory Medicine, Landeskliniken Salzburg, Salzburg, Austria
3 Department of Internal Medicine, Landeskliniken Salzburg, Salzburg, Austria
4 Department of Internal Medicine, University of Innsbruck, Innsbruck, Austria
5 Department of Surgery, Krankenhaus Hallein, Hallein, Austria

Obesity is frequently associated with type 2 diabetes. We previously observed an association of a functional G/A polymorphism in the uncoupling protein 2 (UCP2) promoter with obesity. The wild-type G allele was associated with reduced adipose tissue mRNA expression in vivo, reduced transcriptional activity in vitro, and increased risk of obesity. On the other hand, studies in animal and cell culture models identified pancreatic ß-cell UCP2 expression as a main determinant of the insulin secretory response to glucose. We therefore ascertained associations of the -866G/A polymorphism with ß-cell function and diabetes risk in obesity. We show here that the pancreatic transcription factor PAX6 preferentially binds to and more effectively trans activates the variant than the wild-type UCP2 promoter allele in the ß-cell line INS1-E. By studying 39 obese nondiabetic humans, we observed genotype differences in ß-cell function; wild-type subjects displayed a greater disposition index (the product of insulin sensitivity and acute insulin response to glucose) than subjects with the variant allele (P < 0.03). By comparing obese subjects with and without type 2 diabetes, we observed genotype-associated differences in diabetes prevalence that translated into a twofold age-adjusted risk reduction in wild-type subjects. Thus, the more common UCP2 promoter G allele, while being conducive for obesity, affords relative protection against type 2 diabetes.


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